I should note, however, I do have a certain amount of concern over this possibility insofar as it could lead to a greater polarization of our nation, as people find themselves only getting their information from sources that reinforce their own prejudices.

I think you see some of that already with the internet and, especially, with blogs.

Republicans gravitate towards Free Republic, for example, while Democrats gravitate towards Democratic Underground. If those types of sites are the only place where each side gets their information, and if that trend continues to "broadcast" news, it can lead to a certain insular thinking and intellectual laziness that ill serves us as a nation.